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The anterior thoracic nerve from the C5 to C8 roots innervates the pectoralis major and minor, and the thoracodorsal nerve from C6 to C8 roots innervates the latissimus dorsi muscle. The axillary nerve is formed by fibers of the C5 to C6 roots which go through the posterior cord of the plexus and innervate the deltoid and teres minor muscles, as well as part of the skin of the lateral shoulder.
Nerve roots: C5-C7. Motor functions: Innervates the muscles in the anterior compartment of the arm â the coracobrachialis, biceps brachii and the brachialis. Sensory functions: Gives rise to the lateral cutaneous nerve of forearm, which innervates skin on the lateral surface of the forearm.